From: Thomas Zimmerman <thomas@zimres.net>
To: linux-kernel@vger.kernel.org
Cc: "Theodore Ts'o" <tytso@mit.edu>, Buddy Lumpkin <b.lumpkin@comcast.net>
Subject: Re: EXT intent logging
Date: Sat, 7 Aug 2004 18:54:58 -0700 [thread overview]
Message-ID: <20040808015458.GA11279@darklands> (raw)
In-Reply-To: <20040806195615.GA14163@thunk.org>
On 06-Aug 03:56, Theodore Ts'o wrote:
> "mount -o data=journal" logs metadata blocks and data blocks into
> journal first, and then after the transaction commits, the metadata
> and data blocks are written to their final location on disk. The
> problem with this is that all your write bandwidth is cut in half
> since all block writes get written twice to disk --- once to the
> journal, and once to the final location on disk.
While you do half your write bandwidth, there arn't any _seeks_ while
writing to the journal. For IO workloads where a sync allows you to
move on to another job, this can speed up your workload. Mail delivery
on an old laptop disk was ~2 as fast using ext3 data=journal...
Thomas
prev parent reply other threads:[~2004-08-08 1:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-06 4:55 EXT intent logging Buddy Lumpkin
2004-08-06 9:57 ` Daniel Pittman
2004-08-06 13:22 ` Doug McNaught
2004-08-06 16:36 ` Buddy Lumpkin
2004-08-06 18:46 ` Bernd Eckenfels
2004-08-06 19:56 ` Theodore Ts'o
2004-08-07 4:50 ` Buddy Lumpkin
2004-08-08 1:54 ` Thomas Zimmerman [this message]
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